on the united states embassy. >> i know there are some who ask why don't we just ban such a video. and the answer is enshrined in our laws. our constitution protects the right to practice free speech. i accept that people are going to call me awful things every day. and i will always defend their right to do so. and we must agree, there is no speech that justifies mindless violence. >> in the last couple of weeks, he pointed out those are probably not the result of a video and were coordinated. he also delivered in his remarks a stern warning to iran over its nuclear ambition. >> let me be clear. america wants to resolve this issue through diplomacy and we believe there is still time and space to do so. but that time is not unlimited. we respect the right of nations to access peaceful nuclear power. but one of the purposes of the united nations is to see that we harness that power for peace. make no mistake, a nuclear-armed iran is not a challenge that can be contained. it would threaten elimination of israel, the security of gulf nations, and the stability of the global economy.